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Not originally published in LIFE. American and United Nations troops enjoy a Jack Benny performance at a USO show in Korea, July, 1951. Michael Rougier—Time & Life Pictures/Getty Images

LIFE: The Korean War

On the anniversary of the start of the Korean War, LIFE commemorates America's so-called "Forgotten War" with pictures -- none of which ever ran in LIFE magazine -- by three of the era's finest photographers: Margaret Bourke-White, Carl Mydans and Michael Rougier.